Jam-up and Put down

Jam-up noun - A crowded mass (as of cars) that impedes or blocks movement.

Put down and jam-up are semantically related. In some cases you can use "Put down" instead a verb phrase "Jam-up".

Put down verb - To express scornfully one's low opinion of.

Jam-up and put down are semantically related. Sometimes you can replace phrase "Jam-up" with "Put down", this terms are similar.